BACnet® Protocol ACH550 AC Drives

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16 ACH550 BACnet User’s Manual Diagnostics Fault Queue for Drive Diagnostics For general ACH550 diagnostics information, see “Diagnostics” in the ACH550 User’s Manual. The three most recent ACH550 faults are reported to the fieldbus as defined below. Drive Parameter 0401 Last Fault AV18 0412 Previous Fault 1 AV19 0413 Previous Fault 2 AV20 BACnet Access Point Serial Communication Diagnostics Network problems can be caused by multiple sources. Some of these sources are: • Loose connections • Incorrect wiring (including swapped wires) • Incorrect baud rate • Bad grounding • Duplicate station numbers • Incorrect setup of drives or other devices on the network The major diagnostic features for fault tracing on an EFB network include Group 53 EFB Protocol parameters 5306…5309. The “Parameter Descriptions” section, in the ACH550 User’s Manual, describes these parameters in detail. Diagnostic Situations The sub-sections below describe various diagnostic situations – the problem symptoms and corrective actions. Normal Operation During normal network operation, 5306…5309 parameter values act as follows at each drive: • 5306 EFB OK MESSAGES advances (advances for each application message properly received and addressed to this drive). • 5307 EFB CRC ERRORS does not advance at all (advances when an invalid message CRC is received). • 5308 EFB UART ERRORS does not advance at all (advances when character format errors are detected, such as parity or framing errors). • 5309 EFB status value varies depending on network traffic. Diagnostics
ACH550 BACnet User’s Manual 17 • 5316 EFB PAR 16 (MS/TP token counter) advances for each token passed to this drive. Loss of Communication The ACH550 behavior, if communication is lost, was configured earlier in "Communication Fault" on page 14. The parameters are 3018 COMM FAULT FUNC and 3019 COMM FAULT TIME. The “Parameter Descriptions” section in the ACH550 User’s Manual describes these parameters in detail. No Master Station on Line If no master station is on line: Neither 5306, EFB OK MESSAGES, nor the errors (5307 EFB CRC ERRORS and 5308 EFB UART ERRORS) increase on any of the stations. To correct: • Check that a network master is connected and properly programmed on the network. • Verify that the cable is connected, and is not cut or short circuited. Duplicate Stations If two or more stations have duplicate numbers: • Two or more drives cannot be addressed. • Every time there is a read or write to one particular station, the value for 5307 EFB CRC ERRORS or 5308 EFB UART ERRORS advances. To correct: Check all station numbers and edit conflicting values. Swapped Wires If the communication wires are swapped (terminal A on one drive is connected to terminal B on another): • The value of 5306 EFB OK MESSAGES does not advance. • The values of 5307 EFB CRC ERRORS and 5308 EFB UART ERRORS are advancing. To correct: Check that the RS-485 lines are not swapped. Fault 28 – Serial 1 Err If the drive’s control panel shows fault code 28 “SERIAL 1 ERR”, check for either of the following: • The master system is down. To correct, resolve problem with master system. • The communication connection is bad. To correct, check communication connection at the drive. • The time-out selection for the drive is too short for the given installation. The master is not polling the drive within the specified time-out delay. To correct, increase the time set by parameter 3019 COMM FAULT TIME. Fault 31 – EFB1 If the drive’s control panel shows fault code 31 “EFB1”, the drive has an invalid object instance ID. To correct, use parameters 5311 and 5317 and establish a unique drive ID that is in the range 1 to 4,194,303. Diagnostics
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BACnet® Protocol ACH550 AC Drives

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